Senior Frontend Engineer

⚠️ Please read first

• This is a full-time, in-person role based in San Francisco (Presidio) - we work from the office 5 days a week .

• You must be based in the Bay Area or willing to relocate before starting .

• We require US work authorisation , but are open to O-1 or J-1 visa sponsorship for exceptional candidates.

About Sauna by Wordware

Most AI products hand you a coworker on day one and hope you trust it. Sauna is the coworker you raise: it starts by learning how you work, earns autonomy task by task, and ends up running hours of work on its own while you keep taste, review, and the final say. Wordware is the ~20-person team behind it, backed by Spark Capital, Felicis, and Y Combinator with a $30M seed, the largest in YC history. We build from a San Francisco office in the shadow of the Golden Gate Bridge, and we work absurdly hard because we can see and feel the outcome every day.

About the Role:

You'll own the frontend of Sauna: shipping interfaces that feel instant, intuitive, and polished even when the underlying work is complex.

What You'll Do:

You'll need to make product and design calls yourself, prototype quickly, and execute without waiting for perfect specs. Sometimes you'll implement designs. Other times you'll create them.

Stack: TypeScript, React, Tanstack, Zustand, TailwindCSS, IndexedDB, Cloudflare Workers.

Who You Are:

Minimum:

• 4+ years of frontend engineering with a portfolio of complex web apps you've shipped. We want to see multiplayer experiences, apps handling large data with sophisticated fetching and caching, or work with server-sent events (SSE).

• You love React and deeply understand state management. You know when to useMemo, how callbacks work, the component lifecycle, and you write beautiful, reusable components. You recognize when props are being drilled through multiple layers and should be lifted into context or Zustand instead.

• You're comfortable owning a full-stack feature. You can do the DB migration, write the route in the backend, fetch on the frontend, and create the UI for it.

• Product sense and design intuition: you can take a rough product direction, sketch an interaction, and ship something that feels right.

• You care about performance. You know when to cache, when to refetch stale data, and how to optimistically update the UI. You notice duplicated network requests. You care about the app feeling snappy and responsive.

• You make design decisions: you'll need to own some UX decisions, create simple designs when needed, and unblock yourself.

• High autonomy, low ego: you don't wait for permission or perfect specs. You ship, gather feedback, and iterate.

• You care about craft: details like loading states, empty states, error messages, keyboard shortcuts. The 1000 small decisions that make software feel good.

Bonus (but not required):

• Experience with multiplayer apps (Y.js, Automerge, CRDTs, or similar real-time collaboration frameworks).

• Built interfaces for LLM-based tools (streaming responses, handling uncertainty, progressive disclosure).

• Experience with local-first architectures (IndexedDB, service workers, sync strategies).

• Design background or strong visual sense: you can make things look good without a designer.

• Been a founding frontend engineer and established standards from scratch.

Compensation & Benefits:

Base salary: $180K–$240K + meaningful early-stage equity + health, dental, 401(k), considerable PTO, gym budget, lunch.

The Process:

We keep our process simple. Exceptional candidates go from first touch to offer within 2 weeks.

1. Application: Submit your resume and answer a few short questions.

2. 15-minute intro call: Align on location, motivation, and logistics. If it's a go, we move fast from here.

3. System design interview: A deep dive into how you think and architect systems. We'll walk through a real Wordware problem together.

4. Final conversation: We answer your questions and scope out the work trial.

5. Work trial: Paid, in person, usually a few days to two weeks. You work on a real project with us. See how we work, see if it fits, both sides.